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Snow trout,  Schizothorax richardsonii  (Gray, 1832), is an economically important fish in the Himalayan region. Snow trout fry (118.53 ± 5.42 mg) were cultured in flow-through systems for 60 days. Fry were fed with four different diets containing: 0.08% vitamin C (D1), 0.5%  Achyranthes aspera  seeds (D2), both vitamin C and seeds (D3), and a control (D4). Average weight (271.82 ± 4.90 g) and specific growth rate (1.39 ± 0.03) were significantly higher in fish fed D3 compared to the others. Digestive enzyme activities were significantly higher in D3 compared to the others. EPA content was significantly higher in D2 (110.33 ± 0.94 mg 100 g −1 ) and D3 (109.87 ± 1.87 mg 100 g −1 ); DHA (342.70 ± 0.77 mg 100 g −1 ) and  n -3 PUFA (496.17 ± 1.82 mg 100 g −1 ) contents were significantly higher in D3 compared to the others. The expression of  fads2d6  was significantly higher in D3 (6.70-fold) and  elovl5  in D2 and D3 (1.51–1.45-fold) compared to the others. Enriched diets improved fish flesh composition.

journal of applied aquaculture

The study of effect of vitamin C and  Achyranthes aspera  seeds enriched diets on the growth, biochemical composition, digestive enzyme activities and expressions of genes involved in the biosynthesis of fatty acids in Snow trout  Schizothorax richardsonii  (Gray, 1832)